I made this game from scratch in a few hours. I designed it specifically to be playable by 1 player (left hand on WASD, right hand on IJKL), but things might get easier when you get 2 people to control 1 spaceship each. The number of asteroids on screen gradually increases, but it increases slower and slower.

My personal record is surviving for 51 seconds - and that was before I slowed down the increase of asteroid count - but admittedly, after practicing for several hours.

I made the game just for myself, but do you have any idea what should I do with it if I wanted to share it properly? I have no experience with that. I'm not even specially eager about doing it.